Dodged a bullet when Mongolian government decided not to grab a stake in the copper and gold deposit his NYSE-listed Ivanhoe Mines discovered in Mongolia. This Chicago-born mining promoter has been touting the discovery. He made his first fortune in 1994 after stumbling onto one of the world's biggest nickel deposits while searching for diamonds in Voisey's Bay, Nfld. Sold Diamond Fields Resources in 1996 for $3.1 billion.

Distribution of Billionaires by Residence

Diameter of disc reflects size of fortune. The red disc indicates Robert Friedland